NC0025526_Instream Assessment_19941108

NPDES DOCIMENT !;CANNIN` COVER SHEET
AN ilk,
AlMly
.,
.,
Adak
NPDES Permit:
NC0025526
Walnut Cove WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Renewal Application
Speculative Limits
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
November 8, 1994
This document is printed on reuse paper - ignore any
content on the reYerse side

North Carolina Division of Environmental Management
Water Quality Section / Rapid Assessment Group
November 8, 1994
MEMORANDUM
To: Steve Mauney
From: Farrell Keoug -
Through: Carla Sanderson W
Ruth Swanek
Subject:
Summary
Instream Assessment Town of Walnut Cove Waste Water Treatment Plant
NC0025526 Town Fork Creek [03-02-01]
Stokes County Winston-Salem Region
An Instream Assessment for the Town of Walnut Cove has been completed by Technical Support. The
Winston-Salem Regional Office has requested this assessment due to the facility's inability to meet its
NPDES BOD5 and flow limits consistently. An increase of 0.010 mgd and relaxed BOD5 limits were
requested. With the addition of 0.010 mgd flow to the yearly average flow of 0.2374 mgd, the plant will
reach a flow of 0.2474 mgd. A prated flow limit of 0.300 mgd has been proposed, which is above the
current design capacity of 0.192 mgd.
The Town of Walnut Cove Waste Water Treatment Plant has had operational problems, due to the lack of
process control capabilities of their dual facultative lagoons. With this SOC, the Town requests an
increase in domestic flow and an interim BOD5 limit of 60 mg/I. This is the second SOC request within a
one year period, but the first requested SOC was never signed, therefore never instituted.
A Level-B analysis was performed to assess the impact of the additional flow and relaxed BOD5 limits.
The modeling analysis for this assessment indicated that the additional wasteflow under the proposed
interim limits will not cause a violation of the EMC 67 (b) criteria; i.e. not causing a dissolved oxygen sag of
greater than 0.5 mg/l and not exceeding the dissolved oxygen sag length of greater than 0.5 miles.
The Town of Walnut Cove Waste Water Treatment Plant may discharge up to approximately 0.300 mgd,
(which should facilitate wet weather conditions) in total flow without violating the 67 (b) criteria.

Walnut Cove Waste Water Treatment Plant
NC0025526 Stokes County
Evaluation & Discussion
The Town of Walnut Cove Waste Water Treatment Plant discharges into Town Fork Creek, a class "WS
IV" waterbody, which flows into the Dan River in the Roanoke River Basin. Town Fork Creek drains
approximately 113 square miles at the discharge site. The USGS estimates the following flows at the
discharge site:
summer 7010 flow = 8.9 ds
winter 7010 flows 20 ds
Average flow = 130 cfs
The segment of the waterbody where the Walnut Cove Waste Water Treatment Plant discharges is slow
moving, with a bed gradient of approximately 4.9 feet per mile for 3.6 miles before discharging into the
Dan River.
The Town currently has dual facultative lagoons and cannot meet either its BODE or flow limits. The Town
has proposed to expand its wastewater capabilities to treat up to 0.500 mgd and install new treatment.
To date, the type of treatment selected for this plant is still under review. In addition, a subbasin analysis
of Town Fork Creek and its tributaries, is currently being reviewed to be included in the Roanoke Basin
Management Plan. The Town of Walnut Cove WWTP should keep in contact with both the Region and
the Technical Support Branch during this upgrade process to insure that future requirements can be
met.
Recommendations
Due to the inability of the present system at the Walnut Cove Waste Water Treatment Plant to meet the
NPDES limits, the Technical Support Branch will concur with the Region's recommendations for relaxed
limits until such time as an upgraded system is installed. The modeling analysis indicated that the 67 (b)
criteria will be met, but the SOC permitted flow far exceeds the design capacity of the facility. These flow
exceedences are probably due to poor flow estimate procedures by the facility rather than actual
discharges in amounts which exceed the Permitted levels. Better flow measuring will be one of the areas
upgraded during this SOC period. Since the 67 (b) criteria was met under this higher flow, an addition of
0.010 mgd of domestic flow may be added. The following represents the SOC proposed limits:
Effluent Characteristics Monthly Average
Wasteflow (mgd): 0.300
BOD5 (mg/1): 60
NH3-N (mg/1): 24
DO (mg/I): -
TSS (mg/I): 90
Fecal Coliform (/100 mf): 200
pH (SU): 6 - 9
If there are any further questions regarding these recommendations, please feel free to contact me.
cc: Dianne Wilburn, Compliance
Central Files
David Russell, WSRO

Walnut Cove Waste Water Treatment Plant
NC0025526 Stokes County
TABLE 1. lnstream Assessment Summary for the Town of Walnut Cove Waste Water Treatment Plant
Wasteflow Assumptions
Design Capacity
Pre-SOC Wasteflow
SOC Flow Requested
Pre-SOC + SOC Flow + Wet Weather contingency flow
Model Input Summary
Headwater Conditions:
s7Q10 8.9 cfs
Qave 130 cfs
Design Temperature 25 c C
CBOD 2.0 mg/I
NBOD 1.0 mg/I
DO 7.44 mg/I
Wastewater Inputs:
1st Wasteflow
2nd Wasteflow
CBOD (1.5 * BOD5 )
NBOD (4.5 * NH3-N)
0.2374 mgd
0.300 mgd
90 mg/l
108 mg/I
Model Output Summary
0.192 mgd
0.2347 mgd
0.0100 mgd
0.300 mgd
Qw End DO Net Distance Net
(mgd) Minimum Change < 5.0 mg/I Change
0.2374 6.49 rVa rVa n/a
Reayested Soc Flow
0.300 6.24
0.25 rVa Na

Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
Existing WLA checked:
Staff Report:
Topo checked:
USGS Flows confirmed:
IWC Spreadsheet:
Stream Classification:
Nutrient Sensitivity:
Instream Data: x
1987: no previous WLA's in file. Two reach modeling analysis w/ 30 / 90 limits for 0.192 mgd flow - Limits remained unchanged -
1992: WLA requested with SOC and EA for proposed expansion from 0.192 to 0.500 mgd. Facility chose ammonia limit for current
discharge. Facility was having BOD violations during this Permit review period, hence the SOC, excellent modeling notes in
file). An SOC memorandum was sent out in January, 1993 for the same problems of meeting BON with a requested flow
increase of 0.02 mgd, (making the SOC for 0.1797 mgd, which was below the Permitted discharge).
1994 (SOC info): Staff Report indicates that modified SOC was signed by Town Manager on 6 / 8 / 93, but not yet signed off by
State. This Staff Report covers the many issues involved with this SOC very well and will not be re -addressed here. The
engineer working on this Permit, (Alvarez) has recently informed me that the Town's consultants are planning on installing a
constructed wetlands for treatment. Alvarez's judgment is that the soils, groundwater elevations, and types of waste will be
well treated by this system. Also, the designer of this system is a consultant who has designed, installed, and dealt with
constructed wetlands for twenty years.
SOC is for inability to meet BOD5 of 30 mg/l, (average over last year was 30.41 mg/).
Average flow over last year was 0.2374 mgd, (per SOC request form)
Current SOC request 0.01 mgd
Total Post - SOC flow 0.247 mgd
Requested BOD5 = 60 mg/1
Model runs: (1) w/ requested Limits BODs 60 mg/I and NH3N 24 mg/I for pre-SOC flow of 0.2374 mgd
(2) w/ requested Limits BODs 60 mg/I and NH3-N 24 mg/l for post-SOC flow of 0.2474 mgd
Dissolved Oxygen sag occurs in Reach 3: Total A DO sag = 6.46(1) - 6.21(2) a 0.25 mg/1 (for an SOC flow of 0.3 mgd)
Total A Dissolved Oxygen sag length Total A DO sag length = 0.38(2) - 0.38(1) a 0.0 miles
This conforms to the 67(b) criteria: < 0.5 mg/l A Dissolved Oxygen sag
< 0.5 mg/1 A Dissolved Oxygen sag length
Walnut Cove WWTP
NC0025526
100 % Domestic
Existing
SOC
Town Fork Creek
C
03-02-01
Stokes
Winston - Salem
David Russell WSRO
26 October, 1994
B 18 SW
Request # SOC
Stream Characteristic,
USGS #
Date: 1992
Drainage Area (mi2): 113
Summer 7010 (cfs): 8.9
Winter 7010 (cis): 20
Average Flow (cfs): 130
3002 (cfs): 21
IWC (%):
Existing Limitsz
x
x 1994
x during basin modeling analysis
x
nr
x WS IV
Wasteflow (MGD):
BOD5 (mg/1):
NH3N (mg/I):
DO (mg/I):
TSS (mg/l):
Fecal Col. (/100 ml):
pH (SU):
Residual Chlorine (µg/l):
Oil & Grease (mg/1):
TP (mg/I):
TN (mg/I):
There shall be no discharge
Upstream Location:
Downstream Location:
Parameters:
Monthly Averages
Summer Winter
0.192
30
24
90
200
6-9
monitor
monitor
monitor
30
monitor
90
200
6-9
monitor
monitor
monitor
Monthly Averages
Summer Winter
0.500
30
10
30 30
200 200
6-9 6-9
28 28
30
monitor
monitor monitor
monitor monitor
of floating solids or visible foam in other than trace amounts.
at least 100' above discharge
at most convenient point - 2 miles below confluence w/ Lick Creek on
temperature, dissolved oxygen, fecal coliform, conductivity
WO or EL 'Low, *- pot, c tiV6Rb14400
�l P*vrp Ru5seL tW5ES)
rlc -tk,c
uScsd o& d0")
-fk cA tue
EAczck.,.tcr� ... iv .
4/peob3bLz9 CIO -
Town Fork Cre ie/
1�� IS, but- `f h2
POkla eik (OA- pit.
5o k`,t` 4►' 'L s
) a kc - .j bqE �xcctct l - .

MODEL RESULTS
Discharger : WALNUT COVE WWTP
Receiving Stream : TOWN FORK CREEK
SUMMER
POST SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS
The End D.O. is 6.45 mg/1.
The End CBOD is 3.96 mg/l.
The End NBOD is 3.10 mg/l.
WLA WLA WLA
DO Min CBOD NBOD DO Waste Flo
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd)
Segment 1 7.03 0.20 1
Reach 1 90.00 108.00 0.00 0.247400
Segment 2 6.79 0.10 1
Reach 1 45.00 49.50 0.00 0.050000
Segment 3 6.42 2.72 1
Reach 1 0.00 0.00 0.00 0.00000
0 Wr Mur Cove- tiUTTPP
Q Gosk0,3,1- "Tzste..SVRDtViz orq NC00Z895y.3
5AVF.o as = wPLaO t-BDATR-LS
WAWur ctkr, L flyT-j
a.
v
Tcku
N
a y��
Wvr -Rc 34.;5b
s,e-t
9.el-(8+ty O.�Sc$S�1E
s�Q11D Zt0 3,6 =•
,,uiQtQ R1 1-
5 #2) 3 • 6 = 0.5 C3-5/t*►t
QAiJ -jD 1bt-(lb *13N)/3.6 z �-t c�5f mtl
5,2-t - , S R t_-
o.z D. t 3.9
4.1 5.Z 4.9
0 0 0. 2.5
0 0 D•5
0 0 3.1
°to .. 1-i 5
to8 99-S
0.3 0.05

*** MODEL SUMMARY DATA ***
Discharger : WALNUT COVE WWTP Subbasin : 0302
Receiving Stream : TOWN FORK CREEK Stream Class: C
Summer 7Q10 : 8.9 Winter 7Q10 : 20.0
Design Temperature: 25.0
(LENGTH) SLOPE) VELOCITY I DEPTH( Kd 1 Kd I Ka I Ka I KN 1 KN I KNR I KNR I SOD I SOD
1 mile I ft/mil fps 1 ft 'design l @20 Idesign' @20 'design l @20 'design' @20 Idesignl @20
I I
Segment 1 1 0.201 4.901 0.190 1 1.80 1 0.27 1 0.22 1 1.87 1 1.681 0.44 1 0.30 10.44 1 0.00 1 0.00 1 0.00
Reach 1 1 I I 1 1 1 1 1 1 1 1 1 I
I I I I I I I I I I I I I I
Segment 2 1 0.101 5.201 0.100 1 0.85 1 0.27 1 0.22 1 1.04 1 0.941 0.44 1 0.30 1 0.44 1 0.00 1 0.00 1 0.00
Reach 1 1 I I 1 1 1 1 1 1 1 1 1 I
I I I I I I 1 I I I I 1 I I
Segment 3 1 3.401 4.901 0.202 1 1. 89 1 0.27 1 0. 22 1 1.43 1 1.291 0.44 1 0.30 1 0.44 1 0.00 1 0.00 1 0. 00
Reach 1 1 I I I I I I I I I I I I
1 Flow 1 CBOD 1 NBOD 1 D.O. I
1 cfs 1 mg/1 1 mg/1 1 mg/1 I
Segment 1 Reach 1
Waste I 0.383 1 90.000 1108.000 1 0.000
Headwaters i 8.900 I 2.000 1 1.000 1 7.440
Tributary 1 0.000 I 2.000 1 1.000 1 7.440
* Runoff 1 0.000 1 2.000 1 1.000 1 7.440
Segment 2 Reach 1
Waste 1 0.077 1 45.000 149.500 I 0.000
Headwaters) 1.000 1 2.000 1 1.000 I 7.440
Tributary 1 0.000 1 2.000 1 1.000 1 7.440
* Runoff I 0.000 1 2.000 1 1.000 1 7.440
Segment 3 Reach 1
Waste 1 0.000 I 0.000 1 0.000 1 0.000
Headwaters) 0.000 1 2.000 1 1.000 I 7.440
Tributary 1 0.000 1 2.000 1 1.000 1 7.440
* Runoff 1 0.250 1 2.000 1 1.000 1 7.440
* Runoff flow is in cfs/mile

SUMMER
POST SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS
I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I
1 1 0.00 7.13 5.63 5.42 9.28
1 1 0.02 7.12 5.63 5.40 9.28
1 1 0.04 7.11 5.62 5.39 9.28
1 1 0.06 7.10 5.61 5.37 9.28
1 1 0.08 7.09 5.60 5.36 9.28
1 1 0.10 7.08 5.59 5.34 9.28
1 1 0.12 7.07 5.58 5.33 9.28
1 1 0.14 7.06 5.57 5.31 9.28
1 1 0.16 7.05 5.56 5.30 9.28
1 1 0.18 7.04 5.55 5.28 9.28
1 1 0.20 7.03 5.54 5.27 9.28
2 1 0.00 6.90 5.09 4.49 1.08
2 1 0.01 6.89 5.08 4.48 1.08
2 1 0.02 6.88 5.08 4.46 1.08
2 1 0.03 6.87 5.07 4.45 1.08
2 1 0.04 6.86 5.06 4.44 1.08
2 1 0.05 6.85 5.05 4.43 1.08
2 1 0.06 6.84 5.04 4.42 1.08
2 1 0.07 6.82 5.03 4.40 1.08
2 1 0.08 6.81 5.02 4.39 1.08
2 1 0.09 6.80 5.02 4.38 1.08
2 1 0.10 6.79 5.01 4.37 1.08
3 1 0.00 7.00 5.48 5.18 10.36
3 1 0.34 6.83 5.30 4.91 10.45
3 1 0.68 6.69 5.13 4.67 10.53
3 1 1.02 6.59 4.97 4.43 10.62
3 1 1.36 6.52 4.81 4.21 10.70
3 1 1.70 6.47 4.65 4.00 10.79
3 1 2.04 6.44 4.50 3.80 10.87
3 1 12.38 6.42 4.36 3.61 10.96
3 1 12.72 6.42 4.22 3.43 11.04
3 1 3.06 6.43 4.09 3.26 11.13
3 1 3.40 6.45 3.96 3.10 11.21
I Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow I

MODEL RESULTS
Discharger : WALNUT COVE WWTP
Receiving Stream : TOWN FORK CREEK
SUMMER
PRIOR SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS
The End D.O. is 6.49 mg/l.
The End CBOD is 3.87 mg/l.
The End NBOD is 3.01 mg/l.
WLA WLA WLA
DO Min CBOD NBOD DO Waste Flo
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) .(mgd)
Segment 1 7.04 0.20 1
Reach 1 90.00 108.00 0.00 0.23740
Segment 2 6.79 0.10 1
Reach 1 45.00 49.50 0.00 0.05000
Segment 3 6.46 2.38 1
Reach 1 0.00 0.00 0.00 0.00000

*** MODEL SUMMARY DATA ***
Discharger : WALNUT COVE WWTP Subbasin : 0302
Receiving Stream : TOWN FORK CREEK Stream Class: C
Summer 7Q10 : 8.9 Winter 7Q10 : 20.0
Design Temperature: 25.0
ILENGTHI SLOPE' VELOCITY 1 DEPTHI Kd I Kd 1 Ka I Ka I KN 1 KN I KNR I KNR I SOD 1 SOD
1 mile 1 ft/mil fps 1 ft 'design' @20 Idesign' @20 'design l @20 'design' @20 (design) @20
I I i I I I I I I
Segment 1 1 0.201 4.901 0.190 1 1.80 10.27 1 0.22 1 1.87 1 1.681 0.44 1 0.30 1 0.44 1 0.00 1 0.00 1 0.00
Reach 1 1 1
1
I I I I I I I I I I I I
Segment 2 I 0.101 5.201 0.100 10.85 10.27 10.22 1 1.04 I 0.941 0.44 1 0.30 i 0.44 10.00 1 0.00 1 0.00
Reach 1 1 I I I I I I I I I I I I
I I I I I I I I I I I I I I
Segment 3 1 3.401 4.901 0.202 1 1.89 1 0.27 1 0.22 1 1.43 1 1.290.44 1 0.30 10.4 4 1 0.00 1 0.00 10.00
Reach 1 1 I I I I I I I I I l I I
I Flow 1 CBOD 1 NBOD 1 D.O. I
I cfs 1 mg/1 1 mg/1 I mg/1 I
Segment 1 Reach 1
Waste 1 0.368 190.000 1108.000 1 0.000
Headwaters) 8.900 1 2.000 1 1.000 I 7.440
Tributary 1 0.000 I 2.000 I 1.000 I 7.440
* Runoff 1 0.000 1 2.000 1 1.000 I 7.440
Segment 2 Reach 1
Waste 1 0.077 1 45.000 1 49.500 1 0.000
Headwaters) 1.000 1 2.000 1 1.000 I 7.440
Tributary 1 0.000 I 2.000 1 1.000 1 7.440
* Runoff 1 0.000 1 2.000 1 1.000 1 7.440
Segment 3 Reach 1
Waste 1 0.000 I 0.000 I 0.000 I 0.000
Headwaters) 0.000 I 2.000 I 1.000 1 7.440
Tributary I 0.000 1 2.000 I 1.000 I 7.440
* Runoff 1 0.250 1 2.000 I 1.000 1 7.440
* Runoff flow is in cfs/mile

SUMMER
PRIOR SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS
I Seg # I Reach # I Seg Mi I D.O. 1 CBOD 1 NBOD I Flow I
1 1 0.00 7.14 5.49 5.25 9.27
1 1 0.02 7.13 5.48 5.23 9.27
1 1 0.04 7.12 5.47 5.22 9.27
1 1 0.06 7.11 5.47 5.20 9.27
1 1 0.08 7.10 5.46 5.19 9.27
1 1 0.10 7.09 5.45 5.17 9.27
1 1 0.12 7.08 5.44 5.16 9.27
1 1 0.14 7.07 5.43 5.15 9.27
1 1 0.16 7.06 5.42 5.13 9.27
1 1 0.18 7.05 5.41 5.12 9.27
1 1 0.20 7.04 5.40 5.10 9.27
2 1 0.00 6.90 5.09 4.49 1.08
2 1 0.01 6.89 5.08 4.48 1.08
2 1 0.02 6.88 5.08 4.46 1.08
2 1 0.03 6.87 5.07 4.45 1.08
2 1 0.04 6.86 5.06 4.44 1.08
2 1 0.05 6.85 5.05 4.43 1.08
2 1 0.06 6.84 5.04 4.42 1.08
2 1 0.07 6.82 5.03 4.40 1.08
2 1 0.08 6.81 5.02 4.39 1.08
2 1 0.09 6.80 5.02 4.38 1.08
2 1 0.10 6.79 5.01 4.37 1.08
3 1 0.00 7.02 5.36 5.03 10.35
3 1 0.34 6.85 5.18 4.77 10.43
3 1 0.68 6.72 5.02 4.53 10.52
3 1 1.02 6.62 4.85 4.30 10.60
3 1 1.36 6.55 4.70 4.09 10.69
3 1 1.70 6.50 4.55 3.88 10.77
3 1 2.04 6.48 4.40 3.69 10.86
3 1 12.38 6.461 4.26 3.50 10.94
3 1 12.72 6.46 4.13 3.33 11.03
3 1 3.06 6.47 4.00 3.17 11.11
3 1 3.40 6.49 3.87 3.01 11.20
1 Seg # I Reach # I Seg Mi I D.O. I CBOD I NBOD I Flow 1

MODEL RESULTS
Discharger : WALNUT COVE WWTP
Receiving Stream : TOWN FORK CREEK
SUMMER
POST SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS (0.3 MGD)
The End D.O. is 6.24 mg/l.
The End CBOD is 4.42 mg/1.
The End NBOD is 3.57 mg/l.
WLA WLA WLA
DO Min CBOD NBOD DO Waste Flo
(mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd)
Segment 1 6.94 0.20 1
Reach 1 90.00 108.00 0.00 0.30000
Segment 2 6.79 0.10 1
Reach 1 45.00 49.50 0.00 0.05000
Segment 3 6.21 2.72 1
Reach 1 0.00 0.00 0.00 0.00000

*** MODEL SUMMARY DATA ***
Discharger : WALNUT COVE WWTP Subbasin : 0302
Receiving Stream : TOWN FORK CREEK Stream Class: C
Summer 7Q10 : 8.9 Winter 7Q10 : 20.0
Design Temperature: 25.0
ILENGTHI SLOPE' VELOCITY I DEPTHI Kd I Kd I Ka I Ka I KN I KN I KNR 1 KNR I SOD I SOD
1 mile I ft/mil fps I ft Idesign' @20 'design l @20 'design' @20 Idesign l @20 'design l @20
Segment 1 I 0.201 4.901 0.192 11.81 10.27 1 0.22 11.88 I 1.691 0.44 10.30 10.44 10.00 1 0.00 1 0.00
Reach 1 1 I I I I I I I I I I I I
Segment 2 I 0.101 5.20) 0.100 10.85 10.27 10.22 11.04 I 0.941 0.44 10.30 10.44 10.00 10.00 10.00
Reach 1 1 I I I I I I I I I I I I
Segment 3 I 3.401 4.90) 0.203 11.89 10.27 10.22 11.44 I 1.291 0.44 1 0.30 1 0.44 1 0.00 10.00 10.00
Reach 1 1 I I I I I I I I I I I I
1 Flow I CBOD I NBOD I D.O. I
1 cfs I mg/1 1 mg/1 1 mg/1 I
Segment 1 Reach 1
Waste I 0.465 190.000 1108.000 I 0.000
Headwaters) 8.900 ) 2.000 1 1.000 I 7.440
Tributary 1 0.000 I 2.000 I 1.000 I 7.440
* Runoff I 0.000 1 2.000 I 1.000 I 7.440
Segment 2 Reach 1
Waste 1 0.077 1 45.000 149.500 I 0.000
Headwaters) 1.000 1 2.000 1 1.000 I 7.440
Tributary I 0.000 I 2.000 I 1.000 I 7.440
* Runoff I 0.000 I 2.000 I 1.000 I 7.440
Segment 3 Reach 1
Waste 1 0.000 I 0.000 1 0.000 I 0.000
Headwaters) 0.000 1 2.000 1 1.000 1 7.440
Tributary ) 0.000 I 2.000 I 1.000 I 7.440
* Runoff 1 0.250 1 2.000 I 1.000 I 7.440
* Runoff flow is in cfs/mile

I Seg # I Reach # 1 Seg Mi I D.O. I CBOD
1 1 0.00 7.07 6.37
1 1 0.02 7.06 6.36
1 1 0.04 7.04 6.35
1 1 0.06 7.03 6.34
1 1 0.08 7.01 6.33
1 1 0.10 7.00 6.31
1 1 0.12 6.99 6.30
1 1 0.14 6.97 6.29
1 1 0.16 6.96 6.28
1 1 0.18 6.95 6.27
1 1 0.20 6.94 6.26
2 1 0.00 6.90 5.09
2 1 0.01 6.89 5.08
2 1 0.02 6.88 5.08
2 1 0.03 6.87 5.07
2 1 0.04 6.86 5.06
2 1 0.05 6.85 5.05
2 1 0.06 6.84 5.04
2 1 0.07 6.82 5.03
2 1 0.08 6.81 5.02
2 1 0.09 6.80 5.02
2 1 0.10 6.79 5.01
3 1 0.00 6.92 6.13
3 1 0.34 6.71 5.93
3 1 0.68 6.55 5.74
3 1 1.02 6.43 5.55
3 1 1.36 6.34 5.37
3 1 1.70 6.27 5.20
3 1 2.04 6.23 5.03
3 1 12.38 6.21 4.87
3 1 J2.72 6.21 4.72
3 1 3.06 6.22 4.57
3 1 3.40 6.24 4.42
I Seg # I Reach # I Seg Mi I D.O. I CBOD
I
I
SUMMER
POST SOC MONTHLY AVERAGE FLOW
SOC REQUESTED LIMITS (0.3 MGD)
NBOD I Flow I
6.31 9.37
6.30 9.37
6.28 9.37
6.26 9.37
6.24 9.37
6.22 9.37
6.21 9.37
6.19 9.37
6.17 9.37
6.16 9.37
6.14 9.37
4.49 1.08
4.48 1.08
4.46 1.08
4.45 1.08
4.44 1.08
4.43 1.08
4.42 1.08
4.40 1.08
4.39 1.08
4.38 1.08
4.37 1.08
5.96 10.44
5.65 10.53
5.37 10.61
5.10 10.70
4.84 10.78
4.60 10.87
4.37 10.95
4.15 11.04
3.95 11.12
3.75 11.21
3.57 11.29
NBOD 1 Flow

NORTH CAROLINA DEPARTMENT OF ENVIRONMENT
HEALTH AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
MEMORANDUM
•
October 26, 1994
TO: Carla Sanderson
Rapid Assessment Group
THROUGH: Steve Mauney 'P\
Water Quality Supervisor
FROM: David Russell D
Environmental Specialist, WSRO
SUBJECT: Instream Assessment for
Town of Walnut Cove WWTP
NPDES No. NC0025526
Stokes County
OCT 2 1994
T�Cili ti�n� SU&ORt. BRANCH
The Town of Walnut Cove is requesting a SOC. In 1992 the Town also requested a
SOC, but for various reasons, the SOC was never signed. An instream assessment was
prepared for the 1992 request and a copy of your section's comments are attached. Please
review the latest instream assessment and provide our office with your comments.
Should you have questions, contact our office.

Request Form for In -stream Assessment for 67B
NAME OF FACILITYJL.d/1 076N,1 '/lf1.6V( itia.r7-7
9y/0z5
SUBBASIN ?3 OZ-- 0/
COUNTY makes REGION fJ5/eO DESIGN FLOW j%,1' 2_ /yj614
RECEIVING STREAM -Z1)/U
BACKGROUND DATA :
A. Why is SOC needed? (Facility is out of compliance with which
Yb
effluent limits?)�
� AA: Die'�4� ��,4/C��f7/�'�
/& . 1k (k evl e c �s/) L A 6 i /,"
W6 u/ ties- f G �/7dC i �i ( (Mo� VD p'�La /200
Poiv
G.+ /�M,� iS :.t Ivy h.ef_ '�'ilr�.evr •7c/0 i5 J „<[ ,'L' �: d
� R.o•�d`a!/ PAS p4�u
/yuL,f)- S'{ /tE..+2,`; r % S ,A. 1 s 17 i..vIh/-2 .
B. History of SOC requests: SPC 62-e s14. n4.4 f�o�Q �„ /'5 a %f Joc 4„0.s-
Newic 5:5Nec
1. Monthly Average waste flow
prior to any SOC
0,23'V
mgd
Time period averaged S /5'5'3 thru ,4 ,5 59& /! 5./
2. Previously approved SOC's: Pox)e_
Date: flow: mgd
Date: flow: mgd
total of previously approved SOC flow: mgd
3. Flows lost from plant flow: U mgd
(facilities that have gone
off line)
4. Current SOC request
5. Total plant flow post-SOC
(sum of original flow and
SOC flow minus losses)
flow: f%. o/ mgd
flow: ©• - i 7 mgd
6. Is this an accurate flow balance for plant? Why/whynot?
1ZL retie /�Ile.2 �� O c.4 ;jpIvt M fri-`
s biz -CM - 6frset o.J
Sri . / "e P—kf L °o CI ' "�'✓S ,As�� t.�ES(� i JN /2 . �` � S r� i.v ,
/Ltir.r!!i,e2 lA / <, /GVCR/eiest'f ,e2e.0-17/5 S

C. Please attach DMR summary for past year for all permitted parame-
ters. If possible, include reports from previous years if
facility has been under SOC for more than a year.
bhla Su.r►hi,uti
CURRENT SOC REQUEST :
A. Request is for domestic or industrial waste? If it is a combin-
ation, please specify percentages.
y (ties %S' !t Pi 600 y,QJ e04' 66,45.9`i c 1:44s94,-,41.eit p? eAhli4
7�t <owNo4, 74,R c7N Res Ile G�or,�asTic �c� v�zc�n- .Gr.si�vpsl��f 2�c.
B. What type of industry? Please attach any pertinent data.
l7 w 4S .'v .,vclus
C. The region proposes the following SOC limits:
BOD5 iC O mg/1 (91)
NH3 mg/1 (1-)21
DO mg/1
TSS /v mg/1
fecal coliform #/100m1
/
pH u>0"`% U SU
other parameters ?ow 30 cQ,
D. What is the basis for !these limits?
ti
30D 64Se c „le( f a,Jsis/leg er-e /,r;;4' offC�° h�1 P
� l.� a 7P S/.• rre 1'L � .� N �� � �f
/-c pz°w /ir►i�U o f J is h/as °N Se�- r,.oN�l'd�iN�' jd/a. -%
-171 ,AAA AA S 6Qeiu_- ASu.ce4 .fey a .A...Gali S' ea", 12aN "tis .e 7-4
o�2aPaae�
0 {,, d� Aoa $ �1� e 640-li/i d�u2i,7 Gaef- aye - P"orr#S // rrw.v(r�
of f 11 / �f. P2 ftLow �UTh 1 C� 04'" ` {
oQ�I lo- 0.1 ly.s o d0yra5tJc LA-5�7/%'
ADC, Aesrca ll A tiotC J1; sc%on.7e& w; II 2e.+.A.;a As
7� 0, 30 1,1ct 0.9e.J- L orb., A.e h pltio da